How can I lock certain channels and external input?

How can I lock certain channels and external input?

Symptom 

Do you want to lock a particular channel, external input, or APP of Smart TV?
You can lock a particular channel or external input through Lock feature and if you enter password in a locked channel, it will be unlocked temporarily.

※ For Smart TVs after 2013, you can lock or unlock a particular APP.

How to fix

Non-Smart TV

<How to set – Models before ‘11>

① Menu → LOCK → Lock System : On

※ Initial password: 0000  

② Block Channel : Locking channels among the ones receiving through antenna

③ Input Block : External input, Component, HDMI lock

<How to set for Smart TV Netcast ‘12~15>

[Home] or [Smart] of remote control → [SETTINGS] → [LOCK] → [Lock System]

① Turn on the lock system to lock.

② Enter the password. ※Initial password: 0000

③ Block Channel: Select the channel and click lock/unlock at the bottom right corner.

④ Input Block: Turn on the input mode that you want to lock and set lock on.

⑤ Application Lock: Select APP to lock.

※ Only Smart TVs after 2013 have Application Lock feature.